In this paper, damaged stability of a Vietnamese wooden fishing boat is analyzed by a set of Theory in Register and by using the Autoship program. The purpose of this study is to optimize the distance between bulkheads to ensure the safety of the ship and also improve the economic efficiency. | ISSN 1859-1531 - THE UNIVERSITY OF DANANG, JOURNAL OF SCIENCE AND TECHNOLOGY, NO. 12(133).2018 15 A STUDY ON DAMAGED STABILITY OF WOODEN FISHING BOATS IN VIETNAM Nguyen Thi Huyen Trang, Pham Truong Thi The University of Danang - University of Science and Technology; nthtrang@, ptthi@ Abstract - In this paper, damaged stability of a Vietnamese wooden fishing boat is analyzed by a set of Theory in Register and by using the Autoship program. The purpose of this study is to optimize the distance between bulkheads to ensure the safety of the ship and also improve the economic efficiency. The authors use the Autoship program to simulate the 3D model of the ship and its positions in cases of the its water flooded one or more compartments. In this study, we mostly use the Added Weight Method to define the position, the change of draft, the change of trim, the heeling and the change of stability of the ship. Key words - damaged stability; wooden fishing boat; Autoship; added weight method; watertight bulkhead. 1. Introduction Studying of damaged stability of ships in Vietnam has not been properly concerned with. In addition, the building process of fishing boats is mostly based on experience though wooden fishing boats play a big role in the marine economy in our country because of their popularity and low cost. In recent years, there have been many serious seagoing accidents involved in wooden fishing boats that affect the lives and property of fishermen. This topic focuses on the study of damaged stability of wooden fishing boats and offers recommendations to increase the safety of ships, minimizing accidents caused by sinking at sea. 2. Approach and methods A ship is said to be in a state of equilibrium when the resultant of all forces acting on it is zero and the resultant moment of the forces is also zero [1]. There are two methods that evaluate the equilibrium conditions of the ship: Lost Buoyancy Method [2, 3]: This method assumes that the .
